138 results on '"Sun, Huilan"'
Search Results
102. A Review of COVID-19 Related Eye Disease
- Author
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Chen, Jing, primary, Pan, Shuyao, additional, Chen, Gang, additional, and Sun, Huilan, additional
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- 2020
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103. Mineral Transition and Chemical Reactivity Evolution of a Low-Lime Calcium Aluminate Clinker with MgO and Na2SO4 Codopants
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Zhang, Di, primary, Sun, Lizhi, additional, Sun, Huilan, additional, Wang, Qiujun, additional, Wang, Bo, additional, and Zhu, Liguang, additional
- Published
- 2019
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104. A carbon microtube array with a multihole cross profile: releasing the stress and boosting long-cycling and high-rate potassium ion storage
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Wang, Bo, primary, Yuan, Fei, additional, Wang, Wei (Alex), additional, Zhang, Di, additional, Sun, Huilan, additional, Xi, Kai, additional, Wang, Dianlong, additional, Chu, Jianhua, additional, Wang, Qiujun, additional, and Li, Wen, additional
- Published
- 2019
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105. A Porous Mooncake‐Shaped Li4Ti5O12 Anode Material Modified by SmF3 and Its Electrochemical Performance in Lithium Ion Batteries.
- Author
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Wang, Bo, Hu, Sisi, Gu, Lin, Zhang, Di, Li, Yazhao, Sun, Huilan, Li, Wen, and Wang, Qiujun
- Subjects
LITHIUM-ion batteries ,METAL-organic frameworks ,SUPERIONIC conductors ,ANODES ,POROUS metals ,LITHIUM ions - Abstract
Reasonably designing and synthesizing advanced electrode materials is significant to enhance the electrochemical performance of lithium ion batteries (LIBs). Herein, a metal–organic framework (MOF, Mil‐125) was used as a precursor and template to successfully synthesize the porous mooncake‐shaped Li4Ti5O12 (LTO) anode material assembled from nanoparticles. Even more critical, SmF3 was used to modify the prepared porous mooncake‐shaped LTO material. The SmF3‐modified LTO maintained a porous mooncake‐shaped structure with a large specific surface area, and the SmF3 nanoparticles were observed to be attach on the surface of the LTO material. It has been proven that the SmF3 modification can further facilitate the transition from Ti4+ to Ti3+, reduce the polarization of electrode, decrease charge transfer impedance (Rct) and solid electrolyte interface impedance (Rsei), and increase the lithium ion diffusion coefficient (DLi), thereby enhancing the electrochemical performance of LTO. Therefore, the porous mooncake‐shaped LTO modified using 2 wt % SmF3 displays a large specific discharge capacity of 143.8 mAh g−1 with an increment of 79.16 % compared to pure LTO at a high rate of 10 C (1 C=170 mAh g−1), and shows a high retention rate of 96.4 % after 500 cycles at 5 C‐rate. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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106. Seeking Inevitable from the Accident——Discussion on the Methodology of Sublimating Agricultural Science and Technology
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Sun Huilan and Yan Zhongbing
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Agricultural science ,Promotion (rank) ,Agricultural machinery ,business.industry ,Mechanical Engineering ,media_common.quotation_subject ,Energy Engineering and Power Technology ,Production (economics) ,Management Science and Operations Research ,Agricultural productivity ,business ,Accident (philosophy) ,media_common - Abstract
Many agricultural technology theory and results is derived from “accidental discovery” of production practice, to explore the general laws of this kind of accident occurred, and found it contains inevitability. Searching actively for accidents in agricultural production and technology promotion and conducting meticulous in-depth and unremitting research can sublimate the theory of agricultural science and technology and have important guiding significance for production practice.
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- 2019
107. Estimation of Soil Moisture Content Based on Competitive Adaptive Reweighted Sampling Algorithm Coupled with Machine Learning
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Ge Xiangyu, 葛翔宇, primary, Ding Jianli, 丁建丽, additional, Wang Jingzhe, 王敬哲, additional, Wang Fei, 王飞, additional, Cai Lianghong, 蔡亮红, additional, and Sun Huilan, 孙慧兰, additional
- Published
- 2018
- Full Text
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108. Estimation of Soil Moisture Content Based on Competitive Adaptive Reweighted Sampling Algorithm Coupled with Machine Learning
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蔡亮红 Cai Lianghong, 孙慧兰 Sun Huilan, 葛翔宇 Ge Xiangyu, 王飞 Wang Fei, 丁建丽 Ding Jianli, and 王敬哲 Wang Jingzhe
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Estimation ,Statistics ,Sampling (statistics) ,Soil moisture content ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Mathematics - Published
- 2018
109. Synergistic Effect of C12A7and CA on Alumina Leaching Property Under Low Calcium/Aluminum Ratio
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Wang Bo, Liu Jiajia, Sun Huilan, Zhang Yubing, and Liu Dongdong
- Published
- 2015
110. Effect of Lime on Alumina Extracting Property of Calcium Aluminate Slag
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Zhang Yubing, Sun Huilan, Ma Lijuan, and Wang Bo
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Materials science ,Aluminate ,Mineralogy ,Sintering ,chemistry.chemical_element ,engineering.material ,Calcium ,chemistry.chemical_compound ,chemistry ,Reagent ,Phase composition ,engineering ,Leaching (metallurgy) ,Nuclear chemistry ,Lime - Abstract
The effect of lime ratio on phase composition and alumina leaching property of MgO-contained calcium aluminate clinker were investigated by analytical reagent, the XRD analysis of its mechanism was discussed. The results showed that: when the sintering temperature was 1350 °C, C/A was 1.4, A/S was 1.3 and the content of MgO was 4%, the increase of the C/A promoted the formation of C12A7 and restrained the formation of Q-phase. The alumina-leaching ratio of the clinker (A/S was 1.3) was increased from 74.33% to 91.34% when the content of CaO was 5.21%.
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- 2015
111. Study on the Production of Ceramic Glass from Calcium-Silica Residue
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Rong Shuo, Zhang Hao, Sun Huilan, and Wang Bo
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Soda-lime glass ,Materials science ,Metallurgy ,engineering.material ,Corrosion ,Bauxite ,chemistry.chemical_compound ,Calcium carbonate ,chemistry ,Fly ash ,visual_art ,engineering ,visual_art.visual_art_medium ,Ceramic ,Leaching (metallurgy) ,Lime - Abstract
Calcium-silica residue is the leaching residue of the lime sinter process which is used to extract alumina from low-grade bauxite or fly ash. The major phases of this residue are dicalcium silicate and calcium carbonate, and the minor phases are aluminates. A large amount of calcium-silica residue is produced because of the high material flow of lime sinter process and most of it is stockpiled. The main contents of the residue, CaO and SiO2, are the same as the main contents of ceramic glass. Therefore, the production of ceramic glass using calcium-silica residue as the main raw materials, B2O3 as fluxing agent and P2O5 as nucleation agent is reported on in this paper. XRD and DSC are used to analyze the property of the ceramic glass. The results show that the flexural strength and corrosion resistance of the ceramic glass obtained through a melting method are better.
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- 2015
112. Synergistic Effect of C12A7 and CA on Alumina Leaching Property Under Low Calcium/Aluminum Ratio
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Liu Dongdong, Sun Huilan, Liu Jiajia, Zhang Yubing, and Wang Bo
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chemistry ,Aluminium ,Reagent ,Phase composition ,Inorganic chemistry ,engineering ,chemistry.chemical_element ,High calcium ,Leaching (metallurgy) ,engineering.material ,Low calcium ,Lime - Abstract
High calcium/aluminum ratio (C/A=12:7) is one of the main problems which inhibit the development of lime sinter process. Decrease the C/A of clinker is studied in this paper. 12CaO•7Al2O3 (C12A7) and CaO•Al2O3 (CA) were synthesized at 1350 °C by analytical pure reagents. The phase composition of sinters was analyzed by XRD and the alumina leaching experiments were carried out. The results show that the optimal alumina leaching ratio of C12A7 and CA are 93.40% and 73.18%. The leaching experiments of the mixture of C12A7 and CA with different proportions were carried out. The alumina leaching ratio of the mixture reaches 91.12% when the content of C12A7 is 40% (in mass). Above this proportion, the alumina leaching ratio increases little. The results show that the existence of C12A7 can promote the leaching property of CA.
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- 2015
113. Crystal Structure and Alumina Leaching Property of Na2O Doped C12A7
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Wang Bo, Zong Shufeng, Sun Huilan, Zhang Jianxin, Zhang Yubing, Liu Dongdong, and Liu Jiajia
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- 2014
114. Effect of Calcium/Aluminium Ratio on Crystal Structure and Al2O3Leaching Property of 12CaO-7Al2O3
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Wang Bo, Zhang Jianxin, Zong Shufeng, and Sun Huilan
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- 2014
115. Decomposition Property of γ-2CaO·SiO2during Leaching Process of Calcium Aluminate Slag
- Author
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Sun Huilan, Wang Bo, Zhang Jianxin, and Zong Shufeng
- Published
- 2014
116. Decomposition Property of γ-2CaO·SiO2 during Leaching Process of Calcium Aluminate Slag
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Wang Bo, Zhang Jianxin, Zong Shufeng, and Sun Huilan
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chemistry.chemical_compound ,Reaction mechanism ,Materials science ,chemistry ,Sodium ,Aluminate ,Inorganic chemistry ,chemistry.chemical_element ,Leaching (metallurgy) ,Calcium ,Hydrate ,Sodium carbonate ,Alkali metal - Abstract
γ-2CaO·SiO2 is one of the main phases of calcium aluminate slag, which is obtained under 1500°C. Although γ-2CaO·SiO2 is more stable than β-2CaO·SiO2, it will still be decomposed by sodium carbonate solution during alumina leaching process, and this will cause the occurrence of secondary reaction. The effect of liquid-solid ratio, caustic alkali, and temperature on decomposition property of γ-2CaO·SiO2 are studied. The secondary reaction mechanism is discussed by XRD analysis. The results indicate that the amount of decomposed SiO2 increase with the increase of caustic alkali concentration, which varies from 30g·L-1; to 70g·L-1. Leaching temperature affects the decomposition of γ-2CaO·SiO2 and secondary reaction obviously. When temperature is above 75°C the influence degree of the latter is more serious than that of the former. XRD results indicate that the stable product of secondary reaction is hydrate garnet at lower temperature, but under higher temperature, hydrate garnet transforms into sodium hydrate alumina-silicate.
- Published
- 2014
117. Effect of Calcium/Aluminium Ratio on Crystal Structure and Al2O3 Leaching Property of 12CaO·7Al2O3
- Author
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Zhang Jianxin, Wang Bo, Zong Shufeng, and Sun Huilan
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Lattice constant ,Materials science ,chemistry ,Aluminium ,Inorganic chemistry ,Analytical chemistry ,Sintering ,chemistry.chemical_element ,Leaching (metallurgy) ,Crystal structure ,Calcium ,Leaching rate ,Sol-gel - Abstract
12CaO·7Al2O3 (C12A7) with different calcium/aluminum ratio (C/A) were synthesized by sol-gel method and high-temperature sintering method in the paper. The phase composition of sinters was analyzed by XRD and the lattice constant was calculated by celref software. Finally, the alumina leaching experiments on sinters obtained from different synthesis methods were carried out. The results show the C/A of sinter with single phase C12A7 is 1.7 and the range of the best alumina leaching rate is between 1.6 and 1.8 when sol-gel method is used. On the other hand, the C/A is 1.6 and the range is between 1.4 and 1.6 when high-temperature sintering method is used. And the alumina leaching rate is direct proportion to the content of C12A7 and is inversely to the lattice constant under a certain conditions. Compared to sol-gel method, high-temperature sintering process can reduce the optimal C/A of C12A7.
- Published
- 2014
118. Reconstruction and analysis of the past five centuries of streamflow on northern slopes on Tianshan Mountains in Northern Xinjiang, China
- Author
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Yang, Yuhui, primary, Chen, Yaning, additional, Wang, Minzhong, additional, and Sun, Huilan, additional
- Published
- 2016
- Full Text
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119. The Effect of Ultrasonic Treatment on Alumina Leaching from Calcium Aluminate Slag
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Zhang Xue-zheng, Guo Dong, Wang Bo, Sun Huilan, and Bi Shi-wen
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inorganic chemicals ,Materials science ,Aluminate ,Metallurgy ,technology, industry, and agriculture ,chemistry.chemical_element ,Slag ,Calcium ,equipment and supplies ,Leaching rate ,complex mixtures ,chemistry.chemical_compound ,chemistry ,Cavitation ,visual_art ,visual_art.visual_art_medium ,Ultrasonic sensor ,Leaching (metallurgy) ,Sodium carbonate - Abstract
The effect of ultrasonic treatment on the alumina leaching properties of calcium aluminate slags was investigated. The effects of the main leaching parameters such as ultrasonic power, leaching time, leaching temperature, and the concentration of sodium carbonate on alumina leaching rate were determined. The mechanism of ultrasonic effects on leaching is also discussed. It was found that the increase in leaching rate was slight, but leaching conditions were improved significantly when ultrasonic treatment was used in the leaching process. Leaching temperature and sodium carbonate concentration decreased by 30°C and 60g•L−1 respectively with the addition of ultrasonic treatment. Ultrasonics would not promote the decomposition of y-2CaOSiO2. The agglomeration of leaching residue was prevented by the cavitation and mechanical effect of ultrasonic treatment.
- Published
- 2011
120. The effect of cooling rate on the leachability of calcium aluminate slags
- Author
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Wang Bo, Sun Huilan, Zhang Xue-zheng, and Bi Shi-wen
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Materials science ,Aluminate ,Metallurgy ,Slag ,chemistry.chemical_element ,Calcium ,Leaching rate ,chemistry.chemical_compound ,Cooling rate ,chemistry ,visual_art ,Particle-size distribution ,visual_art.visual_art_medium ,Leaching (metallurgy) - Abstract
A calcium aluminate slag was synthesized by melting a CaCO3, SiO2 and Al2O3 mixture at 1500 °C for 1h. The effect of cooling rate on alumina leaching and self-disintegration of the calcium aluminate slag were studied. The mechanism was examined using the methods XRD, SEM, and laser particle size analysis. The results indicated that the phase components, alumina leaching property and self-disintegrating property of the calcium aluminate slag were better when cooling rate was lower than 20°C•min−1 . The formation of 2CaOAl2O3•SiO2 and 3CaOAl2O3 decreases alumina leaching rate and self-disintegrating rate when the cooling rate was higher than 20°C•min−1. The conversion rate from s-2CaOSiO2 to y-2CaOSiO2 was still high when cooling rate was between 20°C•min−1 and 50°C•min−1 . Therefore, the main reason of the decrease in self-disintegrating rate was the formation of 2CaO Al2O3•SiO2.
- Published
- 2011
121. Effect of Calcium/Aluminium ratio on MgO containing calcium aluminate slags
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Wang Bo, Guo Dong, Bi Shi-wen, and Sun Huilan
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Materials science ,Aluminate ,Metallurgy ,chemistry.chemical_element ,Slag ,Quaternary compound ,engineering.material ,Calcium ,chemistry.chemical_compound ,chemistry ,Aluminium ,Impurity ,visual_art ,engineering ,visual_art.visual_art_medium ,Leaching (metallurgy) ,Periclase ,Nuclear chemistry - Abstract
MgO is the main impurity in calcium aluminate slags. The presence of MgO will change the nature of the alumina bearing phases and decrease the alumina leaching properties of the slag. In order to remove or reduce the negative effect of MgO, the method of changing the C/A (CaO/Al2O3, molar ratio, excluding CaO in 2CaO·SiO2) of the calcium aluminate slag was studied and the effect on leaching mechanism was also analyzed. The results showed that the formation of the quaternary compound 20CaO·13Al2O3·3MgO·3SiO2 (C20A13M3S3) is inhibited with increasing C/A in the calcium aluminate slag, and the MgO crystallized in the form of periclase under these conditions. There is an optimal C/A to improve the alumina leachability of the calcium aluminate slag. The increase of C/A could not remove the negative effect of MgO on leachability completely, and the optimal C/A of the slag increases with increasing MgO content.
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- 2011
122. Effect of Particle Size on the Microstructure of Cu60Cr40 Alloy by Microwave Sintering
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Liu, Dongdong, primary, Wang, Bo, primary, Dong, Zhongqi, primary, Yin, Suhua, primary, and Sun, Huilan, primary
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- 2015
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123. Effects of 50‐Hz magnetic field exposure on hormone secretion and apoptosis‐related gene expression in human first trimester villous trophoblasts in vitro
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Sun, Wenjun, primary, Tan, Qiu, additional, Pan, Yongmiao, additional, Fu, Yiti, additional, Sun, Huilan, additional, and Chiang, Huai, additional
- Published
- 2010
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124. Synergistically enabling the interface stability of lithium metal batteries with soft ionic gel and garnet-type Li6.4La3Zr1.4Ta0.6O12ceramic filler
- Author
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Wang, Qiujun, Zhu, Weiqi, Su, Ya, Zhang, Di, Li, Zhaojin, Wang, Huan, Sun, Huilan, Wang, Bo, Zhou, Dan, and Fan, Li-Zhen
- Abstract
Lithium metal batteries based on solid electrolytes are considered as promising candidates with high energy density and safety. However, the weak solid-solid contact between electrolyte and electrode can easily lead to interface instability and lithium ions discontinuous migration, which seriously reduces the electrochemical performance of the battery. Herein, we construct a soft gel interfacial layer to improve the stability of the solid-solid interface between electrolyte and electrode by means of polyester-based monomers and imidazole-based ionic liquids. Based on this, garnet-type Li6.4La3Zr1.4Ta0.6O12(LLZTO) particles as inorganic ceramic filler were introduced in the layer to obtain composite electrolytes with high ionic conductivity (up to 1.1 × 10−3S/cm at 25 °C). As a result, the assembled lithium symmetric battery of Li|THCE-15%LLZTO|Li suggests excellent cycling stability with 700 h at 0.1 mA/cm2at 50 °C, and the lithium metal batteries of LFP|THCE-15%LLZTO|Li delivers high initial discharge capacity of 128.2 mA·h/g with capacity retain of 75.48 % after 150 cycles at 2 C. This work paves a new route to build safe and stable lithium metal batteries with synergistic introduction of composite electrolytes between electrolyte and electrode using soft gel interfacial layer and inorganic filler.
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- 2022
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125. Conductive layer coupled mesoporous hard carbon enabling high rate and initial Coulombic efficiency for potassium ion battery.
- Author
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Wang, Bo, Li, Yanan, Yuan, Fei, Sun, Qujiang, Li, Zhaojin, Zhang, Di, Sun, Huilan, Wang, Qiujun, Zhang, Wen, and Wang, Wei
- Subjects
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POTASSIUM ions , *POLYANILINES , *SOLID electrolytes , *POROSITY , *CHARGE exchange , *CARBON , *ELECTRIC conductivity - Abstract
[Display omitted] • Polyaniline coated hollow mesopore hard carbon spheres are precisely tailored. • Polyaniline coating greatly boosts conductivity, while keeping considerable mesopores. • Polyaniline coating helps to form a stable and inorganic-rich SEI layer. • An excellent rate capacity (233.9 mAh g−1 at 5 A g−1) and a high ICE (70.7%) are realized. Hard carbon with rich mesopores is considered as one of the most promising anodes for potassium-ion batteries, resulting from its shortened ions diffusion distance, good electrolyte penetration ability, and highly released stress. However, the well-developed pore channels tend to separate graphite-domains and enlarge direct contact area between electrode/electrolyte, which easily cause discontinuous electrons transfer paths and extra electrolyte depletion, thus leading to poor rate performance and initial Coulombic efficiency (ICE). Hence, we propose polyaniline conductive layer coated hollow mesoporous carbon spheres (HMCS@PAN) tailored based on local protonation reaction strategy, which can enhance conductivity and simultaneously maintain considerable pore structure, accounting for an ultrahigh-rate performance (233.9 mAh/g at 5 A/g) and long cycling life (216.8 mAh/g at 5 A/g over 2000 cycles). Besides, PAN coating can inhibit the direct contact between inner pore channels and electrolyte and reduce the excessive depletion of active ions in the filling of pores with larger pore size, which is conducive to building an even, stable, and inorganic-rich solid electrolyte interphase (SEI) layer, resulting in an excellent ICE (70.7%). This work provides a guidance for the structure design of mesopore hard carbon to improve its rate and ICE. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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126. Reasonable regulation of carbon layers and micropores to promote the extreme capacity of hard carbons for sodium-ion batteries.
- Author
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Zhang, Qiaoyan, Yuan, Fei, Sun, Qujiang, Wang, Qiujun, Li, Zhaojin, Zhang, Di, Sun, Huilan, and Wang, Bo
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SODIUM ions , *MICROPORES , *ZINC acetate , *ZINC , *CARBON , *STORAGE batteries - Abstract
Carbon layers and pores are important sodium storage sites. The amount and morphology of micropores were regulated by controlling the dosage of zinc acetate. Besides, the proper matching of carbon layers and micropores promotes the extreme capacity of hard carbons. [Display omitted] • The content and morphology of micropores were regulated by zinc acetate. • The "insertion" and "pore-filling" mechanisms maximize sodium storage capacity. • The optimized electrode provided an ultra-high reversible capacity of 415.3 mAh/g and excellent cycle stability. Hard carbons are classic anode materials for sodium-ion batteries (SIBs) with huge development potential. They have the advantages of high capacity and great stability. However, the complex and diverse structure poses a formidable challenge for the development of hard carbons. Carbon layers and pores are important components of hard carbons, they play important roles in sodium storage. Structural regulation is often used to improve the properties of hard carbons in order to enhance the sodium storage capacity. Hence, a series of hard carbons were prepared in this work. Zinc acetate was used to construct micropore structure, and the amount and morphology of micropores can be regulated by controlling the dosage of zinc acetate. The sodium storage capacity of hard carbons was maximized by adjusting the ratio of carbon layers to micropores reasonably. The optimized electrode can provide an ultra-high reversible capacity of 415.3 mAh/g. The amazing capacity can still maintain 292.2 mAh/g even at the high current of 2 A/g over 1000 cycles. This study regulates the proper control between carbon layers and micropores, which provides suitable insights for the research and development of hard carbons. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
127. Revealing the mechanism of oxygen-containing functional groups on the capacitive behavior of activated carbon.
- Author
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Li, Zhaojin, Wu, Hui, Zhang, Di, Wang, Qiujun, Sun, Huilan, Sun, Qujiang, and Wang, Bo
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ACTIVATED carbon , *FUNCTIONAL groups , *AQUEOUS electrolytes , *CHEMICAL properties , *ELECTRIC capacity - Abstract
The mechanism of O-doping on the electrochemical behavior of activated carbon has been clearly revealed. [Display omitted] • A mild oxidation way was adopted to achieve the O-doping on the activated carbon. • The O-doping is correlated with the quasi capacitance of active materials. • Introducing the C-O and COOH functional groups can improve the wettability of AC. O-doping is important to regulate the electrochemical behavior of activated carbon (AC) used in supercapacitors. However, the clear mechanism and relationship of O-doping on the capacitance behavior of AC seem contradictory and remain undisclosed. This is because when O-doping is carried out, it often causes changes in the physical and chemical properties such as defect state, structure, and specific surface area of AC. The superposition of these factors on capacitance behavior complicates the research problem. Here, a low-temperature oxidation method was adopted to achieve doping of different forms of O-functional groups on the AC with minimal effect on its structure and specific surface area. It can be found that the effect of O-doping on the double-layer capacitance of AC is relatively small, but positively correlated with the pseudocapacitance. This is because the functional groups C-O and COOH by O-doping can not only improve the wettability between the electrolyte and AC, but also combine with cations in the electrolyte to enhance the pseudo capacitance. The influence mechanism of O-doping on the capacitance behavior of AC has been verified in different electrode systems and aqueous electrolytes. This study provides theoretical support for rational O-doping to enhance the electrochemical performance of AC. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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128. Constructing adaptive silicon–carbon interconnected network for high-energy lithium-ion batteries.
- Author
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Li, Zhaojin, Shi, Conghao, Liu, Pengfei, Di, Yunbo, Zhang, Di, Wang, Qiujun, Sun, Huilan, Sun, Qujiang, and Wang, Bo
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LITHIUM-ion batteries , *HEAT treatment , *ION transport (Biology) , *STRUCTURAL stability , *MELAMINE , *SURFACE energy , *PYROLYTIC graphite , *SILICON alloys - Abstract
Nano-silicon (n-Si)/graphite anodes are highly desirable for high-energy lithium-ion batteries. Nevertheless, the high surface energy of n-Si grains is prone to causing serious agglomeration. In this work, the modified n-Si is evenly dispersed on the g-C 3 N 4 carbon mesh that acquired through melamine heat treatment constructing an adaptive Si-carbon interconnection network structure (mSi 50 /g-C 3 N 4). Ideally, the mSi 50 /g-C 3 N 4 composite can be well dispersed and fill the gaps in graphite through traditional ball milling processes. The obtained mSi 50 /g-C 3 N 4 /Gr composite prevents the accumulation of Si grains which is beneficial for expediting ion transport, improving conductivity and structural stability. As a result, this anode provides a reversible capacity of 621 mAh⋅g−1 at 0.2 C, with high-capacity retention of 93.3 % after 300 cycles at 1 C and low volume expansion of only 28.6 %. Furthermore, it also maintains excellent cycling stability in full batteries with LiFePO 4 cathode. Therefore, constructing the mSi 50 /g-C 3 N 4 network is an effective strategy to achieve uniform dispersion of Si in graphite and promote larger scale industrialization of n-Si/graphite anode. The adaptive Si-carbon interconnection network structure was achieved, which is dedicated to the uniform dispersion of Si on the surface of graphite. [Display omitted] • The mSi 50 /g-C 3 N 4 is obtained by dispersing of modified Si on g-C 3 N 4 carbon mesh that acquired through melamine treatment. • The mSi 50 /g-C 3 N 4 /Gr composite prevents the accumulation of Si grains which is beneficial for expediting ion transport. • The mSi 50 /g-C 3 N 4 /Gr provides a capacity of 621 mAh⋅g−1 at 0.2 C, with a retention rate of 93.3 % after 300 cycles. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
129. In situ catalytic polymerization of LiNO3-containing PDOL electrolytes for high-energy quasi-solid-state lithium metal batteries.
- Author
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Wang, Qiujun, Ma, Yanqiang, Wang, Yaqing, He, Xin, Zhang, Di, Li, Zhaojin, Sun, Huilan, Sun, Qujiang, Wang, Bo, and Fan, Li-Zhen
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POLYELECTROLYTES , *CATALYTIC polymerization , *LITHIUM cells , *ELECTROLYTES , *RING-opening polymerization , *INTERFACIAL reactions - Abstract
• Sc(OTf) 3 eliminates the effect of NO 3 − on DOL ring-opening polymerization. • The gel-polymer-electrolyte exhibits high ionic conductivity and t Li + . • Construction of Li 3 N-rich interfacial layers to protect electrodes and electrolytes. • Construction of a new internal model for a new polymer lithium metal battery. 1,3-Dioxolane (DOL) can be induced to form polymer electrolytes by in situ ring opening polymerization at Lewis acid salts. However, the presence of ion–dipole interactions between NO 3 − and DOL suppresses this polymerization behavior. Herein, we report that the use of Sc(OTf) 3 as an initiator can well disrupt this ion–dipole interaction. The in situ ring-opening polymerization of DOL is achieved to form a LiNO 3 -modified polyDOL-based electrolyte. New mechanism of Li migration in polymer electrolytes have been revealed by molecular dynamics modeling and constructed molecular interface models. It is found that the electrolyte interior is affected by the ion–dipole interactions of Li+ by NO 3 −, which made it easier for Li+ to be released from the polar ether-oxygen ligands on the polymer chain for rapid migration, thus exhibiting an ionic conductivity of 1.8 mS cm−1 and t Li + of 0.78. In addition, NO 3 − preempts the binding sites around Li+, improves the coordination environment, and prioritizes the formation of a kinetically stable anion-derivative interface, which effectively mitigates the interfacial side reactions between the electrodes and the electrolytes. As a result, the assembled solid-state Li||LiFePO 4 cell exhibits an impressive 152.3 mAh/g discharge capacity at 0.5C and maintains 80.3 % of the capacity after 450 cycles at 50 °C. This work not only opens a new avenue for designing high-performance gel polymer electrolytes for more metal-based batteries, but also provides valuable insights into understanding the ion migration mechanism. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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130. Regulating B-N moieties in carbon anode toward stable and fast potassium-storage.
- Author
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Song, Fan, Li, Zihan, Zhang, Di, Sun, Huilan, Li, Zhaojin, Wang, Qiujun, Sun, Qujiang, Yuan, Fei, and Wang, Bo
- Subjects
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MOIETIES (Chemistry) , *ANODES , *CHARGE exchange , *CARBON , *POTASSIUM , *DOPING agents (Chemistry) - Abstract
Boron (B) and nitrogen (N) co-doped hard carbons usually tend to deliver an excellent rate and ultra-long cycle lifespan, because of the formed B-N moieties can accelerate both ion/electron transfer. However, the rational regulation of B-N moieties content is rarely mentioned, and correlating rate and reversible capacity with B-N moieties content is still lacking yet. Hence, a series of B/N co-doped hard carbons are designed based on varied carbonization temperatures. Systematic characterizations prove that the introduced B-heteroatoms can create more defects and form well-developed pore channels. Besides, with increasing carbonization temperatures, B-N moieties content first increases and then decreases, which is in accordance with the evolution of defect degree of carbon matrix. Therefore, rich B-N moieties can induce more defect sites to greatly improve capacitive contribution, and as a result both rate and reversible capacity are strongly correlated with B-N moieties content. Based on this, the electrode with the highest B-N moieties content (79.6 %) realizes an excellent rate (220.9 mAh g−1 at 2 A g−1) and cycling stability (over 2000 cycles). Note that the storage of B-N moieties on K + only occurs in a high potential region (>0.5 V), and this process is highly reversible. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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131. Rationally regulating P-doping species to realize ultrastable potassium storage of carbon anode.
- Author
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Yuan, Fei, Zhang, Sijia, Shao, Yachuan, Wang, Jian, Li, Zhaojin, Zhang, Di, Sun, Huilan, Wang, Qiujun, Wang, Wei, Wu, Yusheng, and Wang, Bo
- Subjects
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CARBON-based materials , *ANODES , *CARBON , *MESOPORES , *POTASSIUM , *SPECIES - Abstract
[Display omitted] • P-O rather than P-C species are positively correlated with carbon interlayer spacing. • An expanded interspacing can allow more K-ions to insertion and accelerate them transfer. • The resulting products realize an excellent rate and high capacity, especially plateau capacity. Implanted phosphorus (P) atoms can greatly broaden carbon interlayer spacing and boost defect content, thus resulting in increased rate and capacity; however, different P-species (e.g., P-C and P-O) are how to affect interspacing and defect still remains unclear, and needs to be fundamentally explored. Herein, carbon materials with controllable P-C and P-O moieties (denoted as PNC-900-T, T = 0.2, 0.3, and 0.4) are first synthesized via a gas-steaming route. Detailed experimental analyses demonstrate that P-O species are positively correlated with interspacing, while P-C bonds devote more to enhancing defect. Besides, the introduced P-dopants can trigger the evolution of pore architecture from mesopores to micro/mesopores mixing and then to micropores. As such, the PNC-900–0.3 with the highest P-O proportion (74.8%) realizes the largest interspacing (0.377 nm), thus enabling more K-ions insertion and accelerating their migration. And its defect and micropores can function as active sites to promote the adsorption storage of K-ions. All these together contribute to high capacity, rate (232.3 mAh/g at 2 A/g), and a prolonged cycle lifespan (230.2 mAh/g over 2000 cycles). The effects of different P configurations on microstructure identified by this work provide an insight into the synthesis of other P-functionalized carbon. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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132. In-situ constructing efficient gel polymer electrolyte with fluoride-rich interface enabling high-capacity, long-cycling sodium metal batteries.
- Author
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Wang, Qiujun, He, Xin, Wang, Yaqing, Ma, Yanqiang, Zhang, Di, Li, Zhaojin, Sun, Huilan, Wang, Bo, and Fan, Li-Zhen
- Subjects
- *
POLYMER colloids , *POLYELECTROLYTES , *SOLID electrolytes , *IONIC conductivity , *METALS , *SODIUM - Abstract
• A series of FEC modified gel polymer electrolytes have been successfully prepared by one-step in-situ polymerization. • By adjusting the FEC content, a stable NaF-rich interface is formed between the electrolyte and the electrode. • Matching Na 3 V 2 (PO 4) 3 cathode delivers excellent cycling stability, with a capacity retention of 95.31% over 1000 cycles at 5 c. Sodium metal batteries (SMBs) are considered feasible candidate for large-scale energy systems. However, complicated reactions between the electrode and electrolyte in liquid electrolyte system lead to poor performance and significant safety issues. Therefore, constructing stable electrode-electrolyte interface is necessary to enhance the comprehensive performance of cells. Utilizing gel polymer electrolytes (GPEs) by in-situ polymerization and moderate additive can effectively address these problems. Herein, a series of fluoroethylene carbonate (FEC) modified GPEs have been successfully prepared by one-step in-situ polymerization, in which trimethylolpropane trimethyl acrylate (TMPTMA) and 1,6-hexanediol diacrylate (HDDA) were used as polymer monomers. As a result, the as-optimized electrolyte, THDP-FEC-2%, exhibited high ionic conductivity (3.77 × 10−3 S cm−1) at 25 °C, high Na+ migration number (0.41), and broad electrochemical window (4.6 V). Encouragingly, the NVP|THDP-FEC-2%|Na cell even exhibited ultra-long cycling stability at high rate (95.31% capacity retention at 5C after 1000 cycles). Such excellent electrochemical performances are attributed to the successful establishment of uniform and dense NaF-rich solid electrolyte interface protection layer. This work is expected to offer interface soft protection layer tuned strategy to construct the ideal interface for high-performance SMBs. [Display omitted] [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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133. Research progress of SiOx-based anode materials for lithium-ion batteries.
- Author
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Li, Zhaojin, Du, Mengjiao, Guo, Xu, Zhang, Di, Wang, Qiujun, Sun, Huilan, Wang, Bo, and Wu, Yimin A.
- Subjects
- *
LITHIUM-ion batteries , *RAW materials , *ENERGY density , *SILICON oxide , *ENERGY storage , *ANODES - Abstract
The reported synthesis methods classified by raw materials and its modification strategies of SiO x materials are comprehended and reviewed. [Display omitted] • The factors influencing the failure processes of SiO x have been elaborated. • The synthesis methods classified by raw materials are summarized and re-evaluated. • Techniques to improve the performance of SiO x have been summarized and discussed. • New research directions and future trends have been generally analyzed and elucidated. Silicon oxides (SiO x , 0 ≤ x ≤ 2) have received extensive attention in the field of energy storage due to their high energy density and without the severe volume change of silicon-based anodes. However, the low initial Coulomb efficiency and poor electronic conductivity of SiO x still need to be improved to achieve the satisfactory performance required for commercial applications. In this review, combining the structural feature, electrochemical and failure mechanism of SiO x , the reported synthesis methods classified by raw materials are summarized and re-evaluated, which provides guidelines for selecting appropriate synthesis methods through specific raw materials. Then the latest research progresses of the improvement strategies of SiO x anode are systematically summarized from the perspective of structure design, compounding with the second phase, pre-lithiation and optimization of electrolyte additives or binders. Finally, we discussed the new research directions and future research trends of SiO x materials. This work not only improves the theoretical basis for the preparation and modification of SiO x materials, but also provides direction guidance for accelerating the commercial application of SiO x anode. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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134. In-situ constructing of dual bifunctional interfacial layers of garnet-type Li6.4La3Zr1.4Ta0.6O12 solid electrolyte towards long-cycle stability for flexible solid metal lithium batteries.
- Author
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Wang, Qiujun, Wang, Yaqing, He, Xin, Ma, Yanqiang, Zhang, Di, Li, Zhaojin, Sun, Huilan, Wang, Bo, and Fan, Li-Zhen
- Subjects
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GARNET , *SOLID electrolytes , *SUPERIONIC conductors , *POLYELECTROLYTES , *LITHIUM cells , *ENERGY density , *IONIC conductivity , *METALS , *ETHYLENE glycol - Abstract
Lithium metal batteries are used widely because of their high security and high energy density. However, the solid electrolytes and electrodes have incompatible interfaces, and the lithium anode is also hindered by dendrite growth. Herein, a bifunctional stable electrode interface layer is constructed by in-situ polymerization of polyester-based monomers and organic solvent, revealing the strong correlation between cathode electrolyte interphase (CEI) on cathode and solid electrolyte interface (SEI) on Li metal anode. The sandwich-like composite electrolyte prepared with garnet Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) active fillers and polymer electrolyte composed of (poly(ethylene glycol) dimethyl ether (PEGDME), trimethylolpropane trimethyllacrylate (TMPTMA), 1,6-hexanediol diacrylate (HDDA)(named as P(PF) 1 TH) exhibits excellent flexibility, wide electrochemical window, and good thermal stability. Moreover, P(PF) 1 TH-10%LLZTO electrolyte has satisfactory ionic conductivity (1.42 × 10−3) at 50 °C and high Li+ transference number (0.547) at 25 °C, and symmetrical Li|P(PF) 1 TH-10%LLZTO|Li cells can run stably for more than 1000 h at 0.1 mA cm−2 at 50 °C. The assembled LiFePO 4 (LEP)|P(PF) 1 TH-10%LLZTO |Li cell shows high discharge capacity of 139.9/122.8 mAh g−1 with capacity retain of 90.64%/97.96% after 200 cycles at 1C/2C. This work introduces a dual functional interface layer between electrolyte and electrode through in-situ polymerization, which brings a new idea for electrode interface compatibility. [Display omitted] • Constructing bi-functional layer between the interface of electrolyte and electrode. • Soft gel layer and garnet-type Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 construct composite electrolyte. • In situ formation of dense and uniform CEI and SEI on LEP and lithium metal. • As-Prepared CSEs have good inhibition on the growth of lithium dendrites. • The matched LFP cathode has stable interface and excellent long-cycle performance. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
135. Edge-nitrogen synergize with micropores to realize fast and durable potassium storage for carbon anode.
- Author
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Yuan, Fei, Wang, Jian, Ma, Qian, Sun, Huilan, Li, Zhaojin, Zhang, Di, Wang, Qiujun, Wu, Yusheng, Li, Wen, and Wang, Bo
- Subjects
- *
DOPING agents (Chemistry) , *TEREPHTHALIC acid , *ANODES , *MELAMINE , *SMALL molecules , *POTASSIUM , *MICROPORES - Abstract
Edge-N (pyridinic/pyrrolic-N) functionalized carbon is a promising anode for potassium-ion batteries, while micropores have been proven to be effective in increasing capacity and cyclability. However, the obtained carbon materials usually exhibit a low N-doping level and edge-N species based on the conventional pyrolysis method, and the exploration of the synergistic effect of edge-N doping and micropores on the potassium-storage performance is still lacking. Herein, a novel strategy is proposed to prepare edge-N doped carbon (ENC-850) by directly pyrolyzing supermolecule precursors self-assembled by terephthalic acid (BDC) and melamine (MA). Because the s -triazine structure in MA is more stable than BDC, which can easily ensure a higher N-doping content in carbon, and the decomposition of s -triazine structure is accompanied by the release of NCNH 2 gas, which enables most doped N-atoms to be of edge-N configurations, favoring the adsorption storage of K-ions. Besides, the released small molecules can create numerous micropores, not only providing active sites, but accommodating volume fluctuation. Therefore, the optimized ENC-850 with the most suitable edge-N content of 60.6% (7.73 at% of total 11.71 at% N-doping) and micropores delivers a high capacity (280 mAh g−1 at 0.5 A g−1) and superior cycling stability (over 2000 cycles). A novel strategy is proposed to prepare edge-N doped carbon (ENC-850) by directly pyrolyzing supermolecule precursors self-assembled by terephthalic acid (BDC) and melamine (MA), and thus the resulting product delivers an excellent cycling stability. [Display omitted] • A supermolecule precursors self-assembly strategy was proposed based on terephthalic acid (BDC) and melamine (MA). • The unique merits of s -triazine structure enables a higher N-doping content and edge-N species. • The obtained sample delivered an excellent capacity and cycling stability of over 2000 cycles. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
136. Cobalt-Mediated Defect Engineering Endows High Reversible Amorphous VS 4 Anode for Advanced Sodium-Ion Storage.
- Author
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Zhang D, Shao Y, Wang J, Li Z, Wang Q, Sun H, Sun Q, and Wang B
- Abstract
Metal sulfides are promising anode materials for sodium-ion batteries (SIBs) due to their structural diversity and high theoretical capacity, but the severe capacity decay and inferior rate capability caused by poor structural stability and sluggish kinetics impede their practical applications. Herein, a cobalt-doped amorphous VS
4 wrapped by reduced graphene oxide (i.e., Co0.5 -VS4 /rGO) is developed through a Co-induced defect engineering strategy to boost the kinetics performances. The as-prepared Co0.5 -VS4 /rGO demonstrates excellent rate capacities over 10 A g-1 and superior cycling stability at 5 A g-1 over 1600 cycles, which is attributed to the defects formed by Co doping, the formed amorphous structure and the robust rGO substrate. The great features of Co0.5 -VS4 /rGO anode are further confirmed in sodium-ion capacitors when the active carbon cathode is used. Additionally, the relationships between metal doping, the derived defects, the amorphous structure, and the sodium storage of VS4 are uncovered. This work provides deep insights into preparing amorphous functional materials and also probes the potential applications of metal sulfide-based electrode materials for advanced batteries., (© 2024 Wiley‐VCH GmbH.)- Published
- 2024
- Full Text
- View/download PDF
137. Halide-mediated endogenous ZnO domain-confined etching strategy: Realizing superior potassium storage in carbon anode.
- Author
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Yuan F, Wu Z, Zhang S, Li Z, Wang Q, Sun H, Zhang D, Wang W, and Wang B
- Abstract
Coupling sites of nitrogen-dopants and intrinsic carbon defects (N/DC) are highly attractive to improve potassium-storage capacity and cycling stability, yet it is hard to effectively construct them. Herein, a novel strategy is proposed to establish abundant N/DC sites in N-doped carbon (ZIF8/NaBr-1-900) by pyrolyzing the mixture of metal-organic framework (ZIF8)/sodium bromide (NaBr). Systematic investigations disclose that the introduced NaBr can promote the full conversion of Zn-N
4 moieties into zinc oxide (ZnO) via a "bait and switch" mechanism. Such formed endogenous ZnO can etch the carbon matrix of the confined domains around the N dopants during pyrolysis process, and meanwhile the released N-atoms from Zn-N4 moieties can largely form edge-N. As such, these N/DC coupling sites enable the resultant carbon to have a more significant capacitive behavior related to fast K-ion migration and high structural stability, leading to 255.3 mAh/g at 2 A/g with a prolonged cycle lifespan over 2000 cycles. Moreover, the assembled K-full battery presents a high energy density of 171.2 Wh kg-1 and excellent cyclability over 5000 cycles. This NaBr-mediated endogenous ZnO domain-confined etching strategy provides a new insight into the exploration of advanced carbon anode., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Inc. All rights reserved.)- Published
- 2024
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138. Mineral Transition and Chemical Reactivity Evolution of a Low-Lime Calcium Aluminate Clinker with MgO and Na 2 SO 4 Codopants.
- Author
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Zhang D, Sun L, Sun H, Wang Q, Wang B, and Zhu L
- Abstract
The mineral formation-transition mechanism, microstructure evolution, crystal structure, pulverization property, and chemical reactivity of the CaO-Al
2 O3 -SiO2 clinker with MgO and Na2 SO4 dopants during the sintering process at 1300 °C for 2.0 h were systematically studied using CaO, Al2 O3 , SiO2 , MgO, and Na2 SO4 as raw materials when the molar ratio of CaO to Al2 O3 is 1.4, the mass ratio of Al2 O3 to SiO2 is 3.0, and the mass percentage of MgO and Na2 SO4 is 2%. The MgO dopant could result in 12CaO·7Al2 O3 and γ-2CaO·SiO2 , transform into 20CaO·13Al2 O3 ·3MgO·3SiO2 , restrain the crystal transformation of 2CaO·SiO2 from β to γ, and then deteriorate the pulverization and alumina leaching property corresponding to parts of Al, Si, and Mg atoms occupying the same lattice positions of the crystal structure. MgO and Na2 SO4 codoped could promote transformation of 20CaO·13Al2 O3 ·3MgO·3SiO2 into 3CaO·3Al2 O3 ·CaSO4 as well as some 2CaO·Al2 O3 ·SiO2 , while 3CaO·3Al2 O3 ·CaSO4 has good alumina leaching property in the Na2 CO3 -NaOH solution. The ultrasonic assistant mainly could promote the diffusion of reactive samples, enhance the separation of agglomeration, and then accelerate the chemical reaction of the sintered clinker with Na2 CO3 -NaOH., Competing Interests: The authors declare no competing financial interest.- Published
- 2019
- Full Text
- View/download PDF
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